Wrangler 392 on 33s and 3.73 Gears?

[Sergio97]

Hello,

It was to my surprise to hear about the Wrangler 392 having 3.73 gears with 33 inch tires (assuming 285/70/17). In my own current situation, I am in the market for tires for my Gladiator Sport with 3.73 gears. Hearing that the 392 will have 33s gave me some comfort that even from the factory, Jeep will put 33s on 3.73s. This gave me comfort that 3.73s will be okay on the 285/70/17 tires that I plan to put on them. Although, I read that this is being done on the 392 because the extra power/torque allows for 4.10s to not be needed on the 392. Does anyone know how much of this is true/accurate? Am I wrong for feeling more comfortable with 285/70/17 on 3.73 because Jeep just did it with the 392? I just am unsure how much an impact that power will actually make. Is the V6 and the 8 speed capable of rolling 285/70/17 for a long time while maintaining reliability? I have read so much about this, some people with JK's ran 3.73 with 35s and had no issues. Some ran JK's on 33s with 3.73 with issues. I understand that it is all about perspective and expectations, but overall this announcement made me feel better about my decision to go with 33 in. 285/70/17 tires on my Gladiator with 3.73 gears.

Any thoughts or comments would be appreciated. Thank you.

Sergio

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[Renegade]

Hello,

It was to my surprise to hear about the Wrangler 392 having 3.73 gears with 33 inch tires (assuming 285/70/17). In my own current situation, I am in the market for tires for my Gladiator Sport with 3.73 gears. Hearing that the 392 will have 33s gave me some comfort that even from the factory, Jeep will put 33s on 3.73s. This gave me comfort that 3.73s will be okay on the 285/70/17 tires that I plan to put on them. Although, I read that this is being done on the 392 because the extra power/torque allows for 4.10s to not be needed on the 392. Does anyone know how much of this is true/accurate? Am I wrong for feeling more comfortable with 285/70/17 on 3.73 because Jeep just did it with the 392? I just am unsure how much an impact that power will actually make. Is the V6 and the 8 speed capable of rolling 285/70/17 for a long time while maintaining reliability? I have read so much about this, some people with JK's ran 3.73 with 35s and had no issues. Some ran JK's on 33s with 3.73 with issues. I understand that it is all about perspective and expectations, but overall this announcement made me feel better about my decision to go with 33 in. 285/70/17 tires on my Gladiator with 3.73 gears.

Any thoughts or comments would be appreciated. Thank you.

Sergio

You should be just fine with 3.73 gears and 33's. The 8-speed automatic is a game-changer.

 

[Moe_Fugga]

You’ll be fine. Just don’t compare the 392 to your V6. That 392 would be fine with 3.21 gears probably haha

 

[BryantJT]

Some of that is the 392 would be an even bigger gas hog with 4.10's, don't read into 3.73 gears and tires being acceptable just because they did it with a motor making nearly double the horsepower.

Gears and tires have almost no correlation as to being "ok" just based on both their sizes. You need to look at the whole vehicle's drivability which there are some nice online apps and charts to see how much different your speedometer and tachometer will be for XX tires and YY gears. And you also need to think about how you drive vs the motor power curve. The 3.6 makes most of its power high up in the rpm range. You won't really see high rpm in 5th through 8th so if a big tire pulls the rpm down, you may not even use the higher gears at all.

Also depends where you live, if you're in flat country, you may not see any difference other than when passing traffic.

 

[Sergio97]

You’ll be fine. Just don’t compare the 392 to your V6. That 392 would be fine with 3.21 gears probably haha

Sounds good! Thank you for your insight. I think i'm gaining a better understanding now. Yeah that's probably true lol ?

 

[TheSolarWizard]

The diesel rubicon comes the same way

youll be fine, especially with narrow 33s

 

[HorneyBadger]

yea, 33's with 3.73's and the V6 is the upper limit. you will lose a little MPG and struggle a little more uphill. That's why the current Rubi with 33's comes with 4.10's. Any bigger tire and you want to change the gearing. Went with 4.56's on my Overland with 35's. Big difference going uphill!

 

[MoparToYou]

I owned a JKU with a 6.4 Hemi, swapped in by AEV. That engine makes enough HP and torque that gearing didn't seem to matter. It came with 4.10s and 35s. I later changed to 37s, and didn't notice a difference in gearing. Like others have said, you can't compare that gearing with that engine to gearing with your V6.

 

[Jeeperjamie]

You will be fine on 33's anything bigger your going to start losing MPGs and it's going to be a dog. You can get away with lighter 35's but that is still going out you around the 14mpg range. Expect around 16-17 MPGs on 33's, that's what most are getting. 4.10 gears with the 8 speed makes a huge difference. On mine I average around 18.5 on 35's with the 4.10 gears, as high as right at 21 on a longer trip.

 

[DocMike]

I'm driving this now....it's fine. Can even sometimes spin the tires at 6,100 feet.
At 9,500 it's sucking wind. I do not tow and I have not.

 

[DocMike]

Sigh....super jealous.

I owned a JKU with a 6.4 Hemi, swapped in by AEV. That engine makes enough HP and torque that gearing didn't seem to matter. It came with 4.10s and 35s. I later changed to 37s, and didn't notice a difference in gearing. Like others have said, you can't compare that gearing with that engine to gearing with your V6.

 

[Smess]

I ordered my 392 today and there was no gear option. Yes AEV did 4.10's with the 6.4's but remember the manufacturers have to have an average mpg across the board for all vehicles in their line up. That is probably another reason for the 3.73. You cant compare the gearing in the different HP models, don't ask me why I never understood it.

What I can tell you for sure is your 285 which is 32.7 with a 3.73 will be perfect. I had a 4.10 in my gas Glad and 35's and it was perfect and I probably could have snuck 37's on there and not re-geared so I can assure you that the 285 and 3.73

Common mistake people make is buying a sport or Sahara/overland and then add a lift and tires and gears and when they are all done if they had just got a Rubicon they would have everything they need including lockers. If you get a sport with cloth and wind up windows and basic stereo than that's a different story.

 

[TheSolarWizard]

How are people ordering without pricing?

 

[Moe_Fugga]

How are people ordering without pricing?

Because they don’t care about pricing.

 

[Orange01z28]

I have 35s on 3.73s and have no issues at all pulling long grades at 75-80 mph

I am not talking about towing though.

I'm much more worried about the D44s themselves with the 392 as opposed to the gear ratio, especially as people put larger tires on and go wheeling.

*poof*

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